<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>点击时添加 "波纹" 效果:</title>
    <style>
        .button {
            position: relative;
            background-color: #4CAF50;
            border: none;
            font-size: 28px;
            color: #FFFFFF;
            padding: 20px;
            width: 200px;
            text-align: center;
            /* Safari */
            -webkit-transition-duration: 0.4s;
            transition-duration: 0.4s;
            text-decoration: none;
            overflow: hidden;
            cursor: pointer;
        }

        .button:after {
            content: "";
            background: #90EE90;
            display: block;
            position: absolute;
            padding-top: 300%;
            padding-left: 350%;
            margin-left: -20px !important;
            margin-top: -120%;
            opacity: 0;
            transition: all 0.8s
        }

        .button:active:after {
            padding: 0;
            margin: 0;
            opacity: 1;
            transition: 0s
        }
    </style>
</head>

<body>

    <h2>按钮动画 - 波纹效果</h2>

    <button class="button">Click Me</button>

</body>

</html>